What component of gasoline gives it such a high enthalpy of combustion?
a) hydrocarbons
b) hydrogen
c) carbon
d) magnesium
e) none of the above

Which of these statements are implied by the second law of thermodynamics? (a) The entropy of an engine (including its fuel and/or heat reservoirs) operating in a cycle never decreases. (b) The increase in internal energy of a system in any process is the sum of beat absorbed plus work done on the system. (c) A heat engine, operating in a cycle, that exhausts no heat to the low-temperature reservoir is impossible. (d) Both (a) and (c). (e) All three [(a), (b), and (c)].

Sketch an enthalpy diagram like the one shown, but for the reaction ${N}_2+{O}_2 \rightarrow 2 {NO}$. Use the bond enthalpy values on the previous page to estimate the change in enthalpy for the reaction.

At 1400 K, $K_{\mathrm{c}}=2.5 \times 10^{-3}$ for the reaction $\mathrm{CH}_4(g)+2 \mathrm{H}_2 \mathrm{~S}(g) \rightleftharpoons \mathrm{CS}_2(g)+4 \mathrm{H}_2(g)$. A $10.0$ L reaction of $\mathrm{H}_2$, and $4.0 \mathrm{~mol}$ of $\mathrm{H}_2 \mathrm{~S}$. Is the reaction mixture at equilibrium? If not, in which direction does the reaction proceed to reach equilibrium?

Steam is escaping from a teapot. Is this a chemical reaction? Explain.

Write out a mechanism for every reaction depicted in the indicated problem.

How does the concentration of a solution affect the rate of reaction?

Determine the reaction at the roller $B . E I$ is constant.

How does the calibration of a bomb calorimeter occur?

What is the relative humidity of the atmosphere? What is the latent heat of condensation, and what is its relevance to the evolution of a thunderstorm or hurricane?

What type of reaction does the following equation represent?

$$\mathrm{FeS}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \mathrm{~S}$$

a. synthesis reaction b. double-displacement reaction c. single-displacement reaction d. decomposition reaction

In which type of reaction do ions in two compounds switch places? a. a synthesis reaction b. a decomposition reaction c. a single-displacement reaction d. a double-displacement reaction

Complete the following sentences so that your answers clearly explain the key terms.

The process of condensation occurs when

Is the specific heat capacity of a substance an intensive or extensive property? Explain.